Feed-water heater



(No Model.)

R. F. PRATT 8v C. D. WAINWRIGHI.

FEE-D WATER HEATER.

No. 388,916. Patented Sept. 4, 1888-L ww-wvww.

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l .Fuller nu NITED STATES PATENTc trice.,

RONELLO F. PRATT, OF REI/TERE, AND CHARLES D. WAINW RIGHT, OF MED- FORD, MASSACHUSETTS, ASSIGNORS TO THE VAINIYRIGHT MANUFAG TUBING COMPANY, OF PORTLAND, MAINE.

FEED-WATER H EATER.

SPECIFICATION forming part of Letters Patent No. 388,916, dated September 4, 1888.

Application filed June i12, i887.

To @ZZ whom z may concern:

Be it known that we, RONELLO F. PRATT, a citizen of the United States, residing at Revere, in the county of Suffolk and State of Massachusetts, and Guantes D. WAINWRIGHT, a

citizen of the United States, residing at Med- Yord, in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Feed-Water Heaters and 1o Purifiers, of which the following is a specilication.

Ourinvention relates to certain improvements in feedwater heaters and purifiers in which the exhaust steam from the engine is i5 utilized to heat and purify the Water fed to the boiler; and the invention consists of pipes arranged one Within the other and inclosed Within two casings, one formiuga water-cham ber and the other asteamchamber, as herein- 2o after fully described, and pointed out in the claims.

Referring to the accompanying drawings, Figure l is a vertical section of a feed-water heater and purifier embodying our invention.

z5 Fig. 2 is a horizontal section taken online .rx of Fig. l. Fig. 3 is a horizontal section through the divided Watenchamber.

A is a hollow base of cast-iron divided horizontally by a partition, B, so as to form two 3o chambers, C D. Upon the top of this basepiece is secured a tube-plate, E, on which is secured a casting, F, with a partition across its center, forming two chambers, G G. The chamber G is in communication with the chamber C by means of a pipe, H.

To the tube-plate Eis secured a series of vertical spirally-corrugated tubes or pipes I I, closed at their upper ends by caps or plugs, and to the casting F is secured the ends of 4o vertical spirallycorrugated tubes or pipes J,

arched over at the top,so that one end is connected to communicate with the chamber G while its other end communicates with the chamber G. The tubes I pass up inside the tubes J, as shown. These spirally-corrugated tubes are inclosed in a casing, K, that forms a chamber for the steam to pass through, and the casing K is inclosed in an outer shell or Feal No. Mali-"L (No model.)

casing, L, the space between the two casings K L forming a water-chamber. The casing K is provided at its lower end with a Wide lia-nge, 1c, that is secured by bolts to the base A, and to this flange k is also secured the outer casing, L, as shown. On thetop of the outer casing, L, is secured a dome, M, and within this dome is a pipe, N, secured at its lower end to the top plate, K', of the casing K, and its upper end passing out of the top of the dome M, as shown.

Cold Water is admitted at P into the charnber C and passes up the pipe H into the chamber G, thence up the tubes J, (on the outside of tubes L) over the arched top, and down on the opposite side into the chamber G', from which it passes by a pipe, Q, into the Waterchamber R between the two casings K L, and from which it passes lo the boiler by apipe, S.

The exhaust-steam is admitted at T into the chamber D, and passes up the tubes I inside the tubes J, and also into the chamber U 7c around the outside of the tubes J, and thence out of the pipe N. The exhaust-steam enter ing the chamber D and passing up the tubes I, and also through the chamber U while the water is passing through the tubes J and up the chamber R, heats the water to about 212 Fahrenheit, and as the carbonate of lime commences to throw off carbonicacid gas, as the temperature is raised above 165 Fahrenheit, the carbonio acid gas passes up into the dome M and escapes by a pipe, WV, While the can bollate of lime is precipitated and the heavier particles fall to the bottom.

It will be seen that the steam entering the tubes I cannot pass through them, they being stopped at the top by a cap or plug. Consequently the lightest steam will always ascend to the top and the Water passing around them inthe tubes J,while steam surrounds the latter, a very high degree of temperature is imparted to the water before it passes into the chamber R, Where it is kept hot by the steam in the chamber U.

Should any scale be deposited upon the tubes I J, the expansion and contraction ofthe said tubes will render them self-cleaning, so

that they are automatically freed from scale without injury to their connections.

By the employment ofthe spirally-corrugated tubes a much greater heating-surface is obtained than with plain tubes occupying the same space, therefore rendering them much more effective in heating; and as the corrugations form asuccession of arches, both longitudinally and transversely,the strength of the tubesis much greater. Therefore a thinner tube can be used, which gives `greater efficiency in the transmission of the heat, and consequently a great saving in fuel.

Instead of thespirally corrugated tubes, annular corrugated tubes or plain tubes may be employed, butnot withsuch beneficial results.

What we claim as our invention isl. In a feed-water heater and purilier, a series of tubes arched at the top and secured at their lower ends to a divided Watenchamber, and provided with internal vertical stopped tubes, all of which are inclosed within suitable steam and Water chambers, substantially as shown and described.

2. In a feed-water heater and purifier, an

outer waterchamber inclosing a steam-chamber in which are placed arched pipes secured at theirlower ends to a divided Water-chamber,

rand provided with internal vertical stopped vertical stopped tubes I,secured to base-plate.

E, the exhaust-steam chamber D,Watercham ber C, and pipe H, substantially as shown and described.

In testimony whereof we have signed our names to this specification in` the presence of two subscribing witnesses.

RoNELLo F. PRATT. oHAnLEs D. WAiNWRiGHT.

Vitnesses:

HENRY W. FoLsoM, E. PLANTA. 

